Firefox: If you're living in a location where local DNS and IP blocks keep you from visiting certain websites, The Pirate Bay Dancing is an extension that undoes that automatically by routing you through random proxy servers.

You can set which websites activate the redirects and the add-on does the rest of the work. Its goal is to easily and quickly redirect you around country specific blocks under the hood, without you having to find and choose your own proxy. If you're in a country where say, Google is blocked, you can set it so it automatically loads the site on a proxy server on future visits.